(19)

(11)

EP 4 448 920 A1

(12)

(43) Date of publication: 23.10.2024 Bulletin 2024/43 (21) Application number: 22851191.1 (22) Date of filing: 16.12.2022

(51) International Patent Classification (IPC):  E21B 17/10(2006.01) E21B 33/138(2006.01) E21B 34/06(2006.01) E21B 21/00(2006.01) E21B 33/16(2006.01) E21B 27/02(2006.01) (52) Cooperative Patent Classification (CPC): E21B 17/1078; E21B 21/003; E21B 33/138; E21B 33/16; E21B 34/063; E21B 27/02 (86) International application number: PCT/US2022/053162 (87) International publication number: WO 2023/114471 (22.06.2023 Gazette 2023/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 16.12.2021 US 202117644668 (71) Applicant: Saudi Arabian Oil Company Dhahran, 31311 (SA)	(72) Inventor: MACHOCKI, Krzysztof, Karol Westhill, Aberdeenshire AB32 6FE (GB) (74) Representative: Osha BWB  2, rue de la Paix 75002 Paris 75002 Paris (FR)